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Atrickle vent is a very small[quantify] opening in awindow or otherbuilding envelope component to allow small amounts of ventilation in spaces intended to benaturally ventilated when major elements of the design—windows, doors, etc.—are otherwise closed.[1][2] Trickle vents are used extensively inEurope and are integrated into window frames to provide minimum ventilation requirements for naturally-ventilated spaces.
The application of trickle vents in naturally-ventilated spaces can help contribute to IEQ Credit 2 under theLEED green building rating system. LEED EA Credit 2 referencesCIBSE Applications Manual 10, which provides advice on the design of naturally-ventilated spaces, recommending the installation of trickle vents in naturally-ventilated spaces. Within the UK, the application of trickle vents is required to meet the requirements of theBuilding Regulations; requirements are described in Guide F, Means of Ventilation.
Trickle vents will help avoid problems associated withpoor ventilation in naturally-ventilated spaces, including reduced risk ofcondensation, avoided over-ventilation (minimizingenergy consumption), and improved comfort through draft avoidance.